tokudai, the dimensions are 4x8x4... i'm semi perpetual, now the bloomroom is shut down for a while... til i can figure out what to do about lighting...

as for the mh ballasts....... i thought they were identicle too, but alas, these mh ballasts have no x3 line to connect an ignitor... i did get the ignitors, but, they don't work.

looking to trade...... two 400w mh ballasts for:

400w hps
600w hps
1000w hps.....
or maybe you know how to add an x3? the prob is you need to add a feed to both sides of the long side of the transformer.
i'm out until i can get another setup....